Intense thunderstorms moved from near Shadehill Reservoir in northwest South Dakota late in the evening of the 21st, to northern Brown County after sunrise on the 22nd. These thunderstorms produced high winds, large hail, rain, and lightning. Considerable crop and property damage were caused mainly by the strong winds and hail. Winds gusts ranged from 55 mph at Mobridge to 60 mph in and around Akaska. Winds of 70 mph were reported at Onaka and Faulkton. The strongest wind gust was reported in Hoven with a peak gust of 72 mph. Widespread damage was reported throughout the area. Many mobile homes, storage sheds, silos, and roofs were damaged or destroyed. Nine miles south and four miles west of Keldron, over two inches in diameter hail fell for 40 minutes, breaking windows and piling in ditches to a depth of four feet. These intense thunderstorms also produced brief heavy rainfall ranging from three-quarters of an inch to over four inches.

August 21, 2011:

The Missouri River at Pierre, Fort Pierre, and Chamberlain/Oacoma fell throughout August as releases on the Oahe Dam were slowly decreased. The Missouri River at Chamberlain/Oacoma fell below flood stage on August 22nd. The extensive damage to homes and roads began to surface as the water receded. The river continued to fall into September.

1893: Four hurricanes are observed in the Atlantic Ocean at the same time. Over a century would pass, 1998 before four hurricanes would again rage together in the Atlantic.

1994: Hurricane John, about 345 miles south of Hilo, Hawaii had winds of 175 mph and pressure at 920 millibars or 27.17 inches of mercury, making it one of the strongest hurricanes ever in the Central Pacific. The 31-day existence made John the longest-lasting tropical cyclone recorded in both the Pacific Ocean and worldwide, surpassing both Hurricane Tina's previous record in the Pacific of 24 days in the 1992 season and the 1899 San Ciriaco hurricane's previous world record of 28 days in the 1899 Atlantic season. John was also the farthest-traveling tropical cyclone in both Pacific Ocean and worldwide, with distance traveled of 7,165 miles, out-distancing previous record holders Hurricane Fico in the Pacific of 4,700 miles in the 1978 season and Hurricane Faith worldwide of 6,850 miles in the 1966 Atlantic season.

This image shows Hurricane John near peak intensity on August 24. The storm's maximum sustained winds at the time were about 160 mph. This image was produced from data from NOAA-11, provided by NOAA.

2003: The Okanagan Mountain fire reaches its destructive peak, destroying 250 homes. Nearly 40,000 residents have been evacuated or are on evacuation alert. The Okanagan Mountain Park Fire is estimated to be 17,000 hectares and continues to grow. Click HERE for more information from CBCNews.ca.

Click HERE for more This Day in Weather History from the Southeast Regional Climate Center.